Paper-cutter



(No Model.) I I G. H. CLARKE -& S. W. ROBINSON.

PAPER BUTTER.

Patented Mar. 18, 1890.

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form for handling.

UNITED STATES PATENT QFFICE.

GEORGE H. CLARKE AND STILLHAN W. ROBINSON, OF COLUMBUS, OHIO.

PAPER-CUTTER.

SPECIFICATION forming part of Letters PatentNo. 423,855, dated March 18, 1890.

Application filed June 13, 1888. Serial No. 276,967. (No model.)

United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented a certain new and useful Improvement in Paper-Cutters, of which the following is a specification.

Our invention relates to improvements in straight-edge paper trimmers or cutters, especially designed for cutting or trimming wall-papers.

The objects of our invention are to produce a neat and simple form of paper-trimmer of this class so constructed as to enable the operator by its use to readily and accurately sever paper placed upon a hard surface, to provide improved means of adjusting the height of the cutting-disk for use with straightedges of different degrees of thickness, to provide for its adjustment to straight-edges of different widths, to causethe frame to run smoothly upon the straight-edge, and to construct said frame in a convenient and desirable These objects we accomplish in the manner illustrated in the accompanying drawings, in whioh- Figure l is a front side elevation of our improved device, showing the cutting-disk elevated to its highest point. Fig. 2 is a plan view of the same. Fig. 3 is an end view showing the disk lowered; and Fig. 4 is a sectional view taken on two planes-namely, on lines 0c 00 of Fig. 2, and continued on line y y of same figure.

Similar letters refer to similar parts thro ughout the several views.

A represents a horizontal frame bed-plate having its ends bent slightly forward, and having formed on said forwardly-extending ends, respectively, vertical downwardly-extending legs a and a, the upper side of each of which is provided with a short upward extension b, as shown.

Pivotally secured to the outer side of one of the leg-extensions b is one end of a knifebar 0, having formed on its remaining end an enlarged head (Z, having formed therein a slot (1, curved but slightly from a vertical line. This head (:1 is adapted to be adj ustably supported against the face of the leg a by means of a set-screw 9, made to pass rearwardly through the slot (1 and thence into a screwhole formed in the extension I) of said leg at. The knife-bar c is formed with an upward extension or enlargement 0, beginning at a point adjoining the slotted head (1 and extending slightly past the center of the length of said bar. The front face of this enlarged portion of the bar 0 is provided with a semicircular depression 0 Extending rearwardly a short distance, and thence upwardly from the rear and top side of the knife-bar c, with which it is formed, is a handle-extension piece e, having formed therewith a suit-able handle e.

Secured by screws or otherwise to the frontface of the enlarged portion 0 of the knifebar 0 at points above the depressed portion 0 is the horizontal arm of, a T-shaped plate f, the central and vertical arm f of which extends downwardly across the center of the depression o D represents a metallic cutting disk or wheel pivotally supported between the lower portion of the plate f and the depressed surface of the knife-bar c by means of a pivotpin h, made to pass rearwardly through the lower end of the arm f of the plate f, and thence loosely through a central hole formed in said disk and having its screw-threaded rear end entering a screw-hole formed in the lower portion of the bar 0. The outer end of this pin h is, as shown, provided with a screwhead to facilitate its insertion or removal.

Formed in the central portion of the plate f is a small screw-hole, into which, for the purpose hereinafter specified, is made to enter a small adj usting screw k.

The upper surface of. the bed-plate A is provided with two parallel rearwardly-extending guide-lugs Z, between which is adapted to be made to slide and rest a slotted metallic clamping-arm m, having a downwardly-bent outer end and having extending downwardly from its under side near said outer end alug 12. Between the lower end of this lug n and a point in the downwardly-bent portion of the clamping=arm m, at about the center of the height of the latter, is pivoted a small frictionroller 13.

Formed on the under side of the bed-plate A, in rear of the leg a, is a short downwardlyextending lug 2', between which and said leg a is pivoted a small friction-roller s.

Formed on the under side of the bed-plate A, at a point adjoining the rear side of the leg at, is a short strengthening-lug f.

Thelower or bearing surfaces of the friction-wheels p and s are upon the same horizontal plane, and are adapted to bear upon and be made to revolve against the upper surface of a suitable straight-edged, loosely embraced between the lower end of the clamping-arm m on one side and lower ends of the legs a a on the opposite or front side. The

clamping-arm m is adj ustably connected with the bed-plate by means of a set-screw w, ex-v tending downwardly loosely through the slot m of the arm m and into a screw-hole-in the bed-plate, and having an enlarged head adapted to. bemade to bear against the upper surface of said arm on each side of its slot.

By the construction above described it will be seen that the set-screw w may be loosened and the arm m drawn forward or backwardand fixed by tightening the set-screw in such position as may be desired toconform tothe width of the straight-edge used. It will also be observed that the screw g may be loosened to admitof the cutting-disk D being elevated or lowered to adjust it for operation with straight-edges of different heights. The lateralrplay of the cutting-disk may be regulated and controlled by turning the screw 70 until its inner end bears against said disk with the desired pressure.

In order to operate our device, the paperj to be cut is first placed upon a metallic or other hard surface y. The cutting device is then adjusted upon the straigllt edge by the means above described, the cutting-edge of the disk being slightly below the lower surface of the straight-edge. The handle e is then grasped by the hand, the thumb resting and bearing upon the handle-extension e. The device is then moved forward, causing the disk D- to revolve, its sharpened or thin edge operating to sever the paper against which it bears.

The means herein shown and described for adjusting the clamping-arm for straightedges of different widths and the means shown for regulating the rotary and lateral movement of the disk are substantially shown in a former patent of the United States, No. 387,621, dated August 14,1888, granted to George H. Clarke, one of the inventors herein named, and are therefore not broadly claimed as new.

It will be observed that by the means herein described the cutting-disk may be easily and readily raised or lowered, and that by theme of the friction-wheels and s an easy bearing is had upon the straight-edge, with but slight friction betweenv the parts.

Having now fully described our invention, what we claim, and desire to secure by Letters Patent, is-

The combination, with the bed-plate A, having frictional roller 3, the knife-bar c, pivotally and adjustably connected therewith, as described, and pivot-edcutting-disk D, of the slotted adjustable clamping-arm m, carrying friction-roller 12, substantially as and for the purpose specified.

GEORGE I-I CLARKE. STILLMAN W. ROBINSON. In presence of-.-

C. W. ALLISON, G. C. SHEPHERD. 

